[Javascript] Promise-based functions should not throw exceptions

最新推荐文章于 2025-08-22 11:32:18 发布

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最新推荐文章于 2025-08-22 11:32:18 发布

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文章标签： javascript ViewUI

原文链接：http://www.cnblogs.com/Answer1215/p/5926759.html

本文介绍了如何使用Promise.resolve()和Promise构造函数实现链式调用的方法，通过这两种方式可以有效地组织异步代码，使代码更加清晰易读。

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You can also start a chain of then() method calls via Promise.resolve() and execute the synchronous code inside a callback:

    function asyncFunc() {
        return Promise.resolve()
        .then(() => {
            doSomethingSync();
            return doSomethingAsync();
        })
        .then(result => {
            ···
        });
    }

An alternative is to start the Promise chain via the Promise constructor:

    function asyncFunc() {
        return new Promise((resolve, reject) => {
            doSomethingSync();
            resolve(doSomethingAsync());
        })
        .then(result => {
            ···
        });
    }

This approach saves you a tick (the synchronous code is executed right away), but it makes your code less regular.

转载于:https://www.cnblogs.com/Answer1215/p/5926759.html